Adjustable friction hinge



FIG. 1 is a top perspective view of the adjustable friction hinge of the invention.

FIG. 2 is a top plan view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a front view thereof.

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

The ornamental design for adjustable friction hinge, as shown and described. 